PICTURES: "Night Shining" Clouds Getting Brighter

PICTURES:
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Too thin and wispy to be seen during the day, night-shining clouds appear after sunset (above, the clouds brighten a Swedish summer night in an undated photograph). Night-shining clouds are high enough in the atmosphere that the sun still hits them, even though it's dark on the ground.

"These clouds exist literally on the edge of space," AIM's Russell said, adding that the clouds form only in a very narrow band a little more than 50 miles (80 kilometers) above Earth's surface.
— Photograph by P-M Heden, TWAN
 
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